利用许昌市2014年1月至12月的PM2．5大气连续自动监测数据，对PM2．5的污染特征、PM2．5的重污染特征进行了分析。结果显示：2014年全市PM2．5年均浓度为83 ug／m3，超《环境空气质量标准》二级浓度限值1．37倍，污染季节主要集中在冬季，其次是春季、秋季，夏季明显低于冬季。2014年重污染日全市PM2．5日均浓度范围为151～411 ug／m3，全市PM2．5平均浓度为201 ug／m3，重污染日主要集中在1月和2月。%The continuous observation data of the air fine particulate matter(PM2.5)in Xuchang from January 2014 to Decem-ber 2014 were used to analyse the pollution characteristics and the heavy pollution characteristics of PM 2.5 .The conclusions are:The annual concentration of PM2.5 in the city was 83 ug/m3 in 2014 which is over the “ambient air quality standards”(3095-2012 GB )two concentration limit 1.37 times.The pollution were mainly concentrated in the winter, followed by spring and au-tumn, summer was significantly lower than in winter.The average PM2.5 concentration was 151 ~411 ug/m3 in the city during heavy pollution days and the heavy pollution average concentration of PM2.5 was 201 ug/m3 in 2014, the heavy pollution days were mainly concentrated in January and February .
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